Renowned for his unparalleled success rate in surgeries, Jun Ha possesses the remarkable ability to predict a person's lifespan upon first meeting them. However, when Sekwang, a notorious mob boss, confuses him for a hired assassin, Jun experiences a unique event: he is unable to discern Sekwang's lifespan. This anomaly piques Jun's interest, and he embarks on an investigation into Sekwang's enigmatic past.